The CAT ALLEYCAT 556 QD in titanium is a 5.56 NATO suppressor built to keep weight low at the end of a carbine barrel. It uses CAT’s Surge Bypass technology to manage gas, sound and blast on semi-automatic rifles, and it mounts through a 1x16LH quick-detach interface. CAT optimizes it for a 14-inch M4 platform and finishes the titanium body in DLC. It fits a general-purpose carbine or a hunting rifle that needs a light can.

Key Specifications

• Overall length is 6.10 inches, short enough to keep a carbine handy.
• Weight is 9.0 ounces in titanium, which keeps the front end of the rifle light.
• Diameter is 1.60 inches, a size that clears most handguards.
• The mount is a 1x16LH quick-detach interface, so the can installs and comes off quickly.
• The minimum barrel length for the titanium model is 10 inches, as CAT rates it.

Frequently Asked Questions

What is the ALLEYCAT 556 optimized for? CAT optimizes it for a 14-inch M4 platform at velocities from 1,100 to 3,200 fps and recommends it for semi-automatic use.

Do I need ATF approval to buy this? No. As of October 9, 2026, ATF no longer requires Form 4 approval, registration or a tax stamp for suppressors. It transfers on a Form 4473 with a background check through a Class 3 (SOT) dealer. State and local laws still apply.

Buy the CAT ALLEYCAT 556 QD Titanium Suppressor, 5.56 NATO

As of October 9, 2026, this suppressor transfers on a Form 4473 with a background check at your Class 3 (SOT) dealer, with no Form 4 or tax stamp; state and local laws still apply. Order through CAT’s silencers and suppressed firearms lineup and our Lubbock, Texas team will handle the transfer, and it ships fast to your Class 3 dealer.